setMwGlobals( 'wgOut', $this->getMockWgOut() ); try { throw new BadTitleError(); } catch ( BadTitleError $e ) { ob_start(); $e->report(); $text = ob_get_clean(); $this->assertContains( $e->getText(), $text ); } } private function getMockWgOut() { $mock = $this->getMockBuilder( OutputPage::class ) ->disableOriginalConstructor() ->getMock(); $mock->expects( $this->once() ) ->method( 'setStatusCode' ) ->with( 400 ); return $mock; } }